That means he's a bit of a 'lad'.......he probably left your room, high fived his mates and stuff then people make stuff up....i don't mean that in a harsh way at all, it's just probably the way he acted.

When people say something about it try not to give a dismissive attitude, but instead simply tell them exactly what you were doing and it's silly they thought otherwise.

From what i can tell it looks like you're having a bit of trouble at uni right? you have a nickname which you don't like. The best thing to do here is just take it in your stride, don't let it look like it bothers you, but at the same time don't stay quite. Assert the best parts of your character into your social group which i'm sure wont be too hard and then they will probably respect you more.

'he's on the rugby team' and coupling that with the fact she said people were talking about it and saying bad things suggests he could have been a major contributing factor the the information which is now being said.